Purpose The purpose of this paper is to examine the relationships among transformational leadership, organizational learning, interpersonal trust and organizational citizenship behavior (OCB). Design/methodology/approach The authors collected data from the manufacturing sector in South Korea. A total of 208 responses were analyzed by employing the structural equation modeling method. Findings The findings showed that transformational leadership directly affected organizational learning, interpersonal trust and OCB; interpersonal trust positively and significantly influenced organizational learning and OCB; organizational learning had direct and significant effects on OCB; and organizational learning mediated the relationship between transformational leadership and OCB. Originality/value The study intends to encourage future research by assessing whether organizational learning and interpersonal trust mediates the link between leaders' behavior and employees' behavior.